[Mono-list] mcs compilation of xsp.exe is a little strange...
Francisco Figueiredo Jr.
Sun, 28 Jul 2002 04:05:55 -0300 (ART)
I just started to play with xsp. Got the cvs code and
tried some aspx coding.
I tried this simple .aspx page :)
But when I run it with xsp.exe I got an ArgumentNull
exception in the Tag constructor.
After some digging, I could see that Tag was being
constructed in the ASPParser.get_tag() method inside
the case switch case Token.IDENTIFIER.
After some more digging, and almost getting crazy
because my Console.WriteLine() calls wasn't appearing
I had no choice but to check what was inside the il :)
Looking at it I could see that some code wasn't there!
More exactly the line that says:
id = tokenizer.value;
wasn't getting compiled. So, the Tag contructor was
getting a null value for its first argument.
I could see that the code is compiled differently
depending if I let the line that constructs the Tag
object or not
As the code is a little big, I will put just the
Main switch statement in ASPParser.get_tag():
IL_0035: ldloc.0 // holds value of token
IL_0036: stloc.s V_10
IL_0038: ldloc.s V_10 //switch (token)
IL_003a: ldc.i4.s 33
IL_003c: beq IL_00f0 // case '%'
IL_0041: ldloc.s V_10
IL_0043: ldc.i4.s 37
IL_0045: beq IL_0064 // case '/'
IL_004a: ldloc.s V_10
IL_004c: ldc.i4.s 47
IL_004e: beq IL_00a0 // case '!'
IL_0053: ldloc.s V_10
IL_0055: ldc.i4 0x3e8
IL_005a: beq IL_0142 // case
IL_005f: br IL_015a // default
and in the IL_0142...
if I let the line:
Tag tag = new Tag(...);
I got the following...:
IL_0144: callvirt instance class
IL_014a: ldc.i4.s 47
IL_014c: callvirt instance bool
IL_0151: newobj instance void
IL_0156: stloc.s V_9
and if I comment out the new Tag line:
IL_0142: ldstr "token.Ident"
IL_0147: call void
IL_014d: ldfld class Mono.ASP.AspTokenizer
IL_0152: callvirt instance string
IL_0158: ldstr "id: "
IL_015e: call string
IL_0163: call void
I even can get my comments that wasn't there before!
As we can see from the second version, *there is* code
to store the return of tokenizer.value in the id local
variable (code IL_014c - IL_0157) as well the code to
call my Console.WriteLine and the constructor. In the
first version, there is the ldloc.1 as in the second
version, what means that, IMHO, mcs was forgetting to
put some code.
Can someone confirm this??
I couldn't find anything about this possibly bug in
I'm using mono runtime and mcs from the monobaselabs
rpm mono-0.12_baselabs-20020726.i386.rpm in a Linux
Mandrake 81 intel.
Thanks in advance and sorry for this length message :)
P.S.: Ah, I could get it working if I change the line:
Tag tag = new Tag(id, get_attributes (), eat ('/'));
Tag tag = new Tag(tokenizer.value, get_attributes (),
Francisco Figueiredo Jr.
O super editor para criação de sites: é grátis, fácil e rápido.